question

I lost my virginity on the 6 of this month and on that same day I took plan b. On the 13th I got a my period or which i thought it was my period and it was a week early it lasted normal amount of day which is 6 days  Then on the 19th I took 3 test and they all came out negative the on the 20th I started spotting then on the 24th I started my period and My original period was supposed to be this but I'm just stressing and freaking out because I don't know if it's normal  or not. Obviously it's my first time taking plan